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#include <machine/rtems-bsd-kernel-space.h>
/*-
* Copyright (c) 2016 Yandex LLC
* Copyright (c) 2016 Andrey V. Elsukov <ae@FreeBSD.org>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <rtems/bsd/sys/param.h>
#include <sys/systm.h>
#include <sys/mbuf.h>
#include <sys/kernel.h>
#include <rtems/bsd/sys/lock.h>
#include <sys/rmlock.h>
#include <sys/socket.h>
#include <net/ethernet.h>
#include <net/if.h>
#include <net/if_pflog.h>
#include <net/if_var.h>
#include <net/if_clone.h>
#include <net/if_types.h>
#include <net/vnet.h>
#include <net/bpf.h>
#include <netinet/in.h>
#include <netinet/ip_fw.h>
#include <netinet/ip_var.h>
#include <netpfil/ipfw/ip_fw_private.h>
static VNET_DEFINE(struct ifnet *, log_if);
static VNET_DEFINE(struct ifnet *, pflog_if);
static VNET_DEFINE(struct if_clone *, ipfw_cloner);
static VNET_DEFINE(struct if_clone *, ipfwlog_cloner);
#define V_ipfw_cloner VNET(ipfw_cloner)
#define V_ipfwlog_cloner VNET(ipfwlog_cloner)
#define V_log_if VNET(log_if)
#define V_pflog_if VNET(pflog_if)
static struct rmlock log_if_lock;
#define LOGIF_LOCK_INIT(x) rm_init(&log_if_lock, "ipfw log_if lock")
#define LOGIF_LOCK_DESTROY(x) rm_destroy(&log_if_lock)
#define LOGIF_RLOCK_TRACKER struct rm_priotracker _log_tracker
#define LOGIF_RLOCK(x) rm_rlock(&log_if_lock, &_log_tracker)
#define LOGIF_RUNLOCK(x) rm_runlock(&log_if_lock, &_log_tracker)
#define LOGIF_WLOCK(x) rm_wlock(&log_if_lock)
#define LOGIF_WUNLOCK(x) rm_wunlock(&log_if_lock)
static const char ipfwname[] = "ipfw";
static const char ipfwlogname[] = "ipfwlog";
static int
ipfw_bpf_ioctl(struct ifnet *ifp, u_long cmd, caddr_t addr)
{
return (EINVAL);
}
static int
ipfw_bpf_output(struct ifnet *ifp, struct mbuf *m,
const struct sockaddr *dst, struct route *ro)
{
if (m != NULL)
FREE_PKT(m);
return (0);
}
static void
ipfw_clone_destroy(struct ifnet *ifp)
{
LOGIF_WLOCK();
if (ifp->if_hdrlen == ETHER_HDR_LEN)
V_log_if = NULL;
else
V_pflog_if = NULL;
LOGIF_WUNLOCK();
bpfdetach(ifp);
if_detach(ifp);
if_free(ifp);
}
static int
ipfw_clone_create(struct if_clone *ifc, int unit, caddr_t params)
{
struct ifnet *ifp;
ifp = if_alloc(IFT_PFLOG);
if (ifp == NULL)
return (ENOSPC);
if_initname(ifp, ipfwname, unit);
ifp->if_flags = IFF_UP | IFF_SIMPLEX | IFF_MULTICAST;
ifp->if_mtu = 65536;
ifp->if_ioctl = ipfw_bpf_ioctl;
ifp->if_output = ipfw_bpf_output;
ifp->if_hdrlen = ETHER_HDR_LEN;
if_attach(ifp);
bpfattach(ifp, DLT_EN10MB, ETHER_HDR_LEN);
LOGIF_WLOCK();
if (V_log_if != NULL) {
LOGIF_WUNLOCK();
bpfdetach(ifp);
if_detach(ifp);
if_free(ifp);
return (EEXIST);
}
V_log_if = ifp;
LOGIF_WUNLOCK();
return (0);
}
static int
ipfwlog_clone_create(struct if_clone *ifc, int unit, caddr_t params)
{
struct ifnet *ifp;
ifp = if_alloc(IFT_PFLOG);
if (ifp == NULL)
return (ENOSPC);
if_initname(ifp, ipfwlogname, unit);
ifp->if_flags = IFF_UP | IFF_SIMPLEX | IFF_MULTICAST;
ifp->if_mtu = 65536;
ifp->if_ioctl = ipfw_bpf_ioctl;
ifp->if_output = ipfw_bpf_output;
ifp->if_hdrlen = PFLOG_HDRLEN;
if_attach(ifp);
bpfattach(ifp, DLT_PFLOG, PFLOG_HDRLEN);
LOGIF_WLOCK();
if (V_pflog_if != NULL) {
LOGIF_WUNLOCK();
bpfdetach(ifp);
if_detach(ifp);
if_free(ifp);
return (EEXIST);
}
V_pflog_if = ifp;
LOGIF_WUNLOCK();
return (0);
}
void
ipfw_bpf_mtap2(void *data, u_int dlen, struct mbuf *m)
{
LOGIF_RLOCK_TRACKER;
LOGIF_RLOCK();
if (dlen == ETHER_HDR_LEN) {
if (V_log_if == NULL) {
LOGIF_RUNLOCK();
return;
}
BPF_MTAP2(V_log_if, data, dlen, m);
} else if (dlen == PFLOG_HDRLEN) {
if (V_pflog_if == NULL) {
LOGIF_RUNLOCK();
return;
}
BPF_MTAP2(V_pflog_if, data, dlen, m);
}
LOGIF_RUNLOCK();
}
void
ipfw_bpf_init(int first)
{
if (first) {
LOGIF_LOCK_INIT();
V_log_if = NULL;
V_pflog_if = NULL;
}
V_ipfw_cloner = if_clone_simple(ipfwname, ipfw_clone_create,
ipfw_clone_destroy, 0);
V_ipfwlog_cloner = if_clone_simple(ipfwlogname, ipfwlog_clone_create,
ipfw_clone_destroy, 0);
}
void
ipfw_bpf_uninit(int last)
{
if_clone_detach(V_ipfw_cloner);
if_clone_detach(V_ipfwlog_cloner);
if (last)
LOGIF_LOCK_DESTROY();
}
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